Wisconsin records connect Chequamegon-Nicolet National Forest with Necedah and the Upper Mississippi River refuge, indicating documentation in moist forest floor, wetland-edge, and river-corridor settings. The June–September peak likely reflects the timing of small-mammal surveys and easier field access as much as any seasonal change in the shrew itself.
The 414 records are records, not an abundance estimate. Cinereus Shrews are seldom found through casual observation and are disproportionately detected by traps or incidental finds, so survey method and effort, not population density alone, drive the mapped pattern.
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